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L. W. TRACY.-

HAND POWER ROOK DRILL.

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Patented Feb..l7, 1885.

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RAND POWER ROCK DRILL. y No. 312,304. Patented Feb. 17, 1885.

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- UNITED STATES LEWIS VrTRAOY, OF BROOKLYN, NEV YORK.

HAN D- POWER ROCK-DBI LL.

sPisCIFIcA'rIoN forming part of Letters Patent NQ. 312,304, datedFebruary 17, 1885.

Appication tiled April 29, 1884. (No model.)

T0 all whom it may concern:

Be it known that I, LEWIs W. TRAcY, a citizen of the United States, anda resident of Brooklyn, county of Kings, State of New York, haveinvented certain new and useful Improvements in Hand-Power Rock-Drills,of which the following is a specification. l

This invention relates to hand-power rockdrills, and in its generalfeatures resembles the rock-drill for which I filed, under Serial No.55,870, an application for United States Letters Patent on March 20,1882.

The present improvements embrace a reciprocating lever movement by whichrotating motion is imparted to the cam-shaft; a novel method of holdingthe drill, which passes entirely through the body of the machine, toreceive the blows of the hammer directly on its end,instead vof beingsecured to a drill holder or plunger,as heretofore; a means by which thehammer can be swung out of its working plane to allow the drill to bewithdrawn through the rear end of the machine, and also variousimprovements in the construction of the mechanical details, all of whichwill be fully described, reference being had to the accompanyingdrawings, in which- Figure l, Sheet l, is a plan view of my improvedrock-drill. Fig. 2, Sheet l, is a longitudinal section. Fig. 3, Sheet 2,is a side view on a reduced scale. Fig. 4, Sheet l, is a transversesection on the line x x, looking Fig. 5, Sheet l, is a transversesection on the liney y. Fig. 6, Sheet 2, is a transverse section on theline z z. Fig. 7, Sheet 2, is a transverse section on the line x a',looking toward the right. Fig. 8, Sheet 2, is a transverse section onthe line z z. Fig. 9, Sheet 2, is a side elevation, partly in section,of the lever movement with the hand-levers removed; and Fig. 10, Sheet2, is a transverse section of the clutch mechanism for holding thedrill.

The frame a a a', body b, threaded sleeve b', and mechanism b2, by whichthe sleeve b isintermittently rotated, are similar in construction towhat is shown in my before-mentioned application. The drill-rod c passesentirely through the threaded sleeve b, and receives the blows of thehammer on its rear end, to which is clamped a clutch to connect it tothe sliding and rotating sleeve cl, actuated by means of a tappet, d',on the cam-shaft e, to raise the drill from the bottom of the hole beingdrilled against the action of the spring di, and by a slidingspring-pawl, lf,which catches in the teeth of the ratchet-wheel d on thesleeve d, to partly rotate it by means of the tappetj", also on thecam-shaft c, striking the top of the slide f2, to which the pawl f ispivoted, said slide being again thrown up by the' spring f after thetappet has cleared the top of the slide f 2. The sleeved slidesin thebearing d", forming a part of or connected to the body b, and its frontend lits in the end of the threaded sleeve b.v

The clutch, secured to the rear end of the drill-rod c, consists of abush', c', provided with two pins which fit into bayonet-slots formed inthe end of the sleeve d, as shown at Fig. 10, a split taper collar, c2,arranged inside the bush c, and the hollow clamping-screw c3, which, bybeing screwed in the end of the bush c', acts on the taper part of thecollar c2, and so contracts it as to grip the drill-rod c vand cause itto move with the sleeve d.

To hold and guide the front end of the drillrod c, a guide-clampconsisting of two jaws, g g', is pivoted to the end of the threadedfeeding-sleeve b', and held together by means of 8o the spring-catch g2,which is secured to thei end of one of them and catches over the end ofthe other one. The pin g3, xed in the end of the feeding-sleeve, insuresthat the guidehole in the two jaws, in which the drill-rod turns freely,shall be central with the feedingsleeve. rlhis guide-clamp may be openedafter the drill has fairly started in the rock, as the cutting end willthen be guided by the hole drilled by it.

In this machine it is the intention to withdraw the drill-rod c from andapply it to the machine through its rear end. To enable this to be done,the head h, secured to the body b by the rods h h and sliding on therods a a of the main frame, is provided with a central hole, and thesliding hammer fi and its spring t" are adapted to be swung off sidewiseon the right-hand rod a in Figs. 7 and 8 as an axis, the bearings of thehammer and the springplate/l2 being open bearings, and said parts areheld down on the left-hand rod c by means IOO of the small bar j, whichpasses through a hole in the head 7L into a hole in the body b,

and is retained in-place by the split pin j.

To remove the drill the hammer il is moved back by the main cams e untilthe spring t" is suiiiciently compressed for the chain 3, one end ofwhich is secured to the plate i2, to be locked over the stud t" on thehammer. The bar j is then drawn out at the rear, after its split pin jis removed, and the hammer and spring swung over sidewise. Theguide-clamp g g is opened and the drill-rod moved back with the clutch cc2 c3 secured to it, said clutch being turned backward to allow the pinsto leave the bayonet-slots in the sleeve d. rIhe clutch is. then removedfrom the drill-rod c by releasing the hollow bolt c3, and the drill-rodslid out through the hole in the head h. The nut-frame k is secured tothe rods a a of the frame, and the feeding-screw sleeve b passes freelythrough a hole in its center, and a nutplate, k', fits into a mortiseformed vertically through it. This nut-plate k has an elongated holewith a thread cut only in the lower part thereof, so that when it isdropped down the feed-screw sleeve b is free to slide through thenut-frame, and it is brought into the threads of the screw by means ofthe small lever-cam k2, pivoted to its upper end and bearing on the topof the nut-frame k when turned as shown at Fig. 5. Continuous rotarymotion is imparted to the cam-shaft e from the hand-levers Z. Z throughthe medium of the connecting-rods m m. These rods m m connect arms onthe leverholders nn to the cranks oo', placed diametrically opposite oneanother on the ends of the cam-shaft e. The leverholders rock on studsprojecting from the sides of the head h, and have several perforatedlugs on their sides, into any of which the handlevers can be Xed,according to the position in which the machine is placed.

'Io overcome the dead-centers of the cranks, springs are brought intoplay (when the cranks `fare on the back deadcenter) to bear againsttheunder sides of the connecting-rods mm, and so move the crank beyondthe center. These springs p p are located in sockets formed on theholders n n', and press against plugs q q', fitted in the sockets. Theprojecting ends of these plugs q g come in contact with the projectionsr 1 on the under side of the connecting-rods m m when the hand leversand cranks are in their extreme backward positions, thus compressing thesprings p p in the sockets of the holders n n', which by theirresilience force the cranks over the dead-centers in the directionindicated by the arrow in Fig. 3, which also clearly shows that when onehandle is in the backward position, as just described, the other is inthe extreme forward position, from which construction and arrangement ofparts it will be seen, referring to Fig. 3, that at the time when thecams e e release the hammer t the spring p is compressed by the'projection 1' on the connecting-rod m, thereby performing the functionsof a cushion to the sudden stoppage ofthe hand-1ever and to the jarwhich would otherwise be imparted to the same by the rollers of thehammer tending to throw the cams suddenly forward as they leave theirextremities, the same action occurring on the other side of the machinewhen the connecting-rod m is in its backward position, so that thesprings acting on the connecting-rods perform other functions thanovercoming the dead-centers of the cam-shaft; and it will be observedthat they only act to overcome the dead-centers when their respectivehandles are in their backward positions, the forward dead-center of eachconnecting-rod being counteracted by the action of the other one,as theymove in opposite directions.

The machine is held in the desired position on a suitable column orframe, part of which, s, Fig. 3, is shown attached to the rear plate,a', of the frame.

I do not claim, broadly, in this application the hand-lever movementshown and described, and by which a continuous rotary motion is impartedto the camshaft from an alternately-reciprocating motion of the two.

hand-levers, as the same will form the subject of another application.

Having now described my invention, what I claim, and desire to secure byLetters Patent, 1s

1. In a hand-power rock-drilling machine, in combination, a slidingbody,a transverselyarranged shaft carried thereby,provided with cams andcranks secured to its ends,two hand- `levers fitted to oscillate on theend plate of the sliding body, a spring-acting hammer sliding on theframe between the main portion of the body and the end plate, twoconnecting-rods by which they are connected to the cranks, and springscarried by the handlevers and arranged to bear on the sides of theconnecting-rods when the cranks are in their backward position and justafter the cams have released the hammer, substantially as and for thepurpose set forth.

2. In a hand-power rock-drilling machine constructed to have thedrill-rod passed longitudinally therethrough, a hammer and its springholding-plate, fitted to slide on the side bars by closed bearings .-onone bar and open bearings on the other bar, and means, substantially asdescribed, for holding the said open bearings in position, incombination, as

'and for the purpose set forth.

3. The body b, plate h, secured thereto by the rods h h, the hand-leverholders n ln,piv oted to the plate h, the connecting-rods m m',connecting the holders n n to the cranks o o, spring-acting plugs q q inthe holders'n n,and arranged to bear-on the sides of the connecting-rodsm m', the cranks o o on shaft e, carried by the body b, the cams e e andspringacting hammer z', combined and arranged so that the hand-leversare alternately in their backward positions, with their respective IOOIIO

cranks on their dead-centers just after the cams have released thehammer, substantially as and for the purpose set forth.

4. In combination, the side bars, a a, the hammer t', slidingthereon,with open bearings on one side, springs t, located between thehammer and spring-plate 2, spring-plate i2, fitted to turn on one of thebars a, body b, plate h, rods h h', and retaining-rod j,passing throughthe plate h, and arranged to hold thev hammer and. spring-plate in theirnormal positions, substantially as and for the purpose set forth.

5. In combination, the sliding hammer t', sliding on the bars a a, Withan open bearing on one side, and provided with stud it, the spring-plate2, also sliding on the bars a a, with an open bearing on one side, thespring i', located between the hammer and springplate, the chain t3,secured at one end to the spring-platea, andhaving its other end adaptedto lit over stud t4, and the side bars, a u, substantially as and forthe purpose set forth.

6. The drill-rod c, bush c', fitting over the drill-rod and providedwith side pins, split collar c2, located in the bush c', hollow bolt c3,fitting in the end of the bush e,for tightening the split collar on thedrill-rod, and control ling-sleeve d, provided with bayonet-slots, inwhich the pins on the bush o t, substantially as and for the purpose setforth.

7. In combination,thehollowrotatingsleeve b and drill-rod c within thesame, the centeringjaws g and g', secured to the end of the sleeve b',the centering guide-pin g3, and the spring-catch g2, substantially asand for the purpose Set forth.

In testimony whereof I have hereunto set my hand at New York, county andState of New York, this 24th day of April, A. D. 1884.

LEWIS W. TRACY.

Witnesses:

ALFRED SHEDLooK, H. D. WILLIAMS.

